Engine.



No; 866,922. l

PATBNTED SEPT. 24,1907.

` 4 gums-snm' a.

movement or adjustmentothis single valve-the direc- 'f To all whom itconcern:

' multipldfcylinderuid pressure operated engine ordrill in which asingle valve isi arranged to control the ad- 2O durable and effective,

y UNITE eras" i ATENT FFIOE.

WILLIAM o. DUNTLYQOFOHICAGO, ILL1NoIs',AssIoNoR 'rocHioAeoPNEUMA'rIoTOOL COMPANY, or eHieAGo, 1LL1NO1s, A CORPORATION OF NEW JERSEY.

f ENGINE.

Specification of Lettersatent,

Patentes sept. 24, 1907.

Be it'known that I, WILLIAM DUNTL'EY, a citizen of the United States,residing at Chicago, Cook county, lll'inois,have inventedV certain newand useful Improvements in Engines or Drill`s,`of which the following isa specification#v i i My invention relates in general to a portablefluid, pressure operated engine adapted more particularly.as. the engineor motor of rotary tools of various` characters, such as Adrills and thelike and iny invention has for its object 'the production of a simpleand efficient engine of this character of maximum power in proportion toits size and weight and embodying a novel and useful con= structionandarrangement off working parts all `asserrilbled and compactlycombinedand inclosed within a supporting casing.

The'pri cipal object o f my invention is to provide a mission andexhaust'of motive -iluid to and romall vof the cylinders and in thereversible form of. engine or drill, to also serve as a reveising valveto control the direction of rotation of the' drill shaft or spindle,thereby simplifying the` valve mechanism, reducing the-number of theparts and,A making the machine orengine more In the preferred and hereinilli'istratedI embodiment 'of`my'invention` the engine or drill consistsof a series or lplurality of ylinders having pistons connected with acrankshaft which is common 'to Aall of them, to and v i from whichcylinders the motive Huid isa'dmitted and released means of a singlevalve which `in suc-h embodimentof. invention, is a rotatable valveactuated for rotated by the tool shaft or spindle. Moreover thearrangement is such that upon the longitudinal I l i tionof rotation of`the euginemay b e reversed.

The differentfeatures ofy advantage and utility possossed by my engineor drill willbe apparent from the description hereinaftergiven.'v r

' I n the drawingsFigure 1 is a verti'cal/:lli'al section taken onlinel-l of Fig. 2 Fig. 2 a trarisversescction lFig. E? a viewsiiiiilartolFig. 4 but in a plane at right angles thereto; Fig. (i asection of the valv on line l6-.6 of i Fig. 4;' Fig. 7 -a'scction of thevalve on line 7-7 of Fig.

4, and Fig. 8l a detailed view of the feed screw nut, etc. The samereference characters are used to designate the same parts in the severalgnres of the drawings.

Referring to the illustrated embodiment ofmy invention', the drillorengine is provided with a casing A' .which iiicloses and supports theplurality of cylinders,. z

the pistons, the single valve, and of the crank shaft coin-V mon to allof the pistons. f The cylinders, in the present instancaare fourinnumber marked A", A2, A3, and A* preferably castl integralwiththecasing and arranged i two sets lying in different and parallelplanes, each set plane while the cylinders Aa and of the second's'et arein the same horizontal plane but below 'the plane of the' cylinders A',and A2. Each ofthe cylinders is provided with a removable cylinder heada by means of which' access may b`e readily hadto the interior of thecylin ders, such head in the present instance screwing info the outerend of the cylinder.

The innerlends of the cylinders communicate witha crank shaftchamber'formed in connection with the l suitable manneras by means ofthelugs a5 fastened4 to such main casing. This curved plate is, in thepresent' instance, providedv 4with a' screw threaded boss a"l to which ahandle (not shown) for supporting the drill or'r f `engine maybe readilysecured. At a point opposite the handle connection of bossa" the casingis provided with another boss aadapted to receive anotherhandle which,inthe present instance, is designed to be vthe live handle inasmuch asit is intended to be hollow yto serve as a conduit for the motive fluidfrom the source of supply, through the boss a to the engine. Such handlearrangement being well known and forming noI part of my presentinventionis notillustrated and need notbe further described. A

The lower end of the inaip arising is providedwith 'a gear casing orcap.C arranged to contain and linclose the gearing hereinafter described.and the same is' (secured in suitable manner to the main casing as bymfeaxi's of a marginal ange andscrews cj `The opgel site end'of the maincasing is,closed bya top cap .Di Y

which is secured to such casing in suitable manner by means of thescrews d. I

i The crankshaft K is located within the' chamber main casing A by meansof a'removable wall orcurved plate A5 which is secured to the maincasing in any.

formed by thewall or plate A5 as already described andthe same isjournaled in' suitable bearings, the :100

upper end thereof being joumaled in tlieloearingsd2 supported in the topcap D vand closed by'th'e sc rew plug D2, and the lower end thereofbeing journaledin similar bearings c2 supported in the gear casing G andL closed at the lower endA by the screw plug C2. The crank shaft is alsojqurnaled intermediate its length in a bearing formed by abushin'g dinserted within 1 season case through the central port b2 and tbetwoIend-ports b and b3, such three ports constituting inlets for the 410ive iiuid into the valve casef. t As shown more clearly in Figs. 4 angl5 the valve E vis provided with three reduced portionsiorniing the vthree annularV grooves e, e and' e3 .which register'respectively withthe ports' 'b, b2 rand b. In theV two heads formed on either side of themiddle groove e2 are formed-a series 'of inlet channels and also aseries of ex' haust ports for properly controllingthe admission andexhaust of the motive fiuid in operating the engine in either direction.Referring first lto the, ports and inlet lcham/tels `formed in the heador portion ofI the valve abovethe annular groove e, ltwo series ot threeports' eachare provided, the same leading inwardly and communicatingwith the longitudinal exhaust passage j e Which-extends downwardly andexhausts intothe gear case from which the `exhaust escapes through theopenings C4 in the sides oi such casing. The twoseries of exhaust portsare arrangedin two sets lying in diffcr- -entl'planes the upper set Ebeing effective andactive when the engine is working in .one directionand the other set F4 being at this time inactive'but arranged tobecomac'tive when thevalve is `adjusted* orA longitu- -dinally moved for`the purpose of operating the engine in the reversfe diretion, inthemanner hereinafter vexplained: The channels E communicate at elltimes with the annular groove eJ for the purpose of conductingv themotive fluid from such groove alternately to the passages B and- B2leading to their respective vset of cylinders. The other set ofchannels-E communicate with the annular grooves for the-purpolse ofconducting the notive fluid therefrom alternately to said passages `Band B2 when thepvalve is adjusted or rnoved upv wztrdly from theposition'indicated inthe drawings. 'In similar manner the head orportionol: the valve .between the annularfgrooves e and e2 is provided withseparate sets of exhaust' p di'ts for lthe'exhaust oi the motivezfl'uidand sep'trate sets oi diannelsjiormthe inlet of themotive fluid.4 'Asshownfthe valve 4is-thereat pro-y vided' with the series of threechannels E? correspondtive fluid from the groove e2 tothe passages-BlandBi Aleading to the lower set of cylinders A and' A accord-l ingtotheillustrated position o the valve and when,

in the rotation of .the valve, such channels are presented v` valve andare arranged to exlxaustthe cylinders A and The series of exhaust portsspend with the channels e2 aie marked l"2 and the same or brought intoregisterfwitln'said passages B and 134..

and passages which 'correjcoxnmunicate with thc'longitudinal air passagein the Athrough said passages Bfand lli-when such exhaust portsarepresented to said last named passages. .This

particular portion er head o the valve is'provided with 55 nnother set-ochannels Iii/corresponding with 4the "chenal, y

e f nels E4 and arranged to conduct the'motive fluid trom Y thegroovole/to s aidxpassages li3 and Bi" but inactive or ineffective' whenever thecorresponding grorwes E4 are inactive, thatis when the valve is in thevposi-tion illustrated in` thc drawing, Correspondingwith thesechannelsE/ is a series of exhaust ports l?"7 communicating Withthelongitudinal exhaust passage e in the valve f and adapted to exhaust themotive fluid from thepas sages B3 and B when `the yvalve-is adjustedfrom the 4 position indicated in the/drawings and when such port's arebrought into register with said and Bf in the rotations of the valve.

It will be observed that the series of channels and exhaust ports.arcarranged in staggcrcdrelationas lpassages B1 clearly indicated in Figs.4 and 'where'itjs seen, for

instance,v that the exhaust ports have their corresponding channelsalternate and also that the channels of one set or series are not inalinement with the channels of the set or series in the samevalve heador portion but are staggered with relation `thereto. Thus the channelsE3 are. located immediately .above the exhaust ports position indicatedin the .drawings-so as'toj render 'active the series of channels E and.E4 and likewise the'series of exhaustV ports l:"`y and F4, whichy'inthe illustrated position, are' inactive and ineffective.` The i upperor'closcd end of the valve'is provided with a rod or stem F which, whileheld against rotation, vis arranged -to' engage the valve so that thelatter may be moved longitudinally by 'means oi suhrod or stem but with;'out interfering with the free rotation of such valve. In the presentinstance I accomplish this result. byproviding'a ball and socketconnection betweenthe valve and lower end oi the rod, which latter ifsprovided with thc ball f fitted within a socket formed ini-the lupperend of the valve body and held in place by thel .retaining disk or platef which-is secured to the valve body in any suitable manner. The rod orvalve stem hasvits bearings in the boss D3 extending upwardly from thetophcap vD andthe same terminates in-a hand piece-or wheel f2`for manualoperation For-the purposc'of holdingor maintaining the valve in one orthe suitable means arranged ita coperate withv the valve stem with .ayielding pressure. Als. shownfinfligfl,A Aone side oi thefvalye stem isprovided wthtwo recesses j? adapted to I'bengaged by -the .springpressed pin dJ'andlocated atsuch points' along the length of the' vvalve stein that-'when the pin enggtges-the upper recess4 the 4 .valveis in proper positioli` for controlling the motive fluidfin onedirection'or rotation of the engine" and that. when the pinl'rl3 is inengagement with theV lower recess the valve isfin proper adjustedposition for controlling' the motive fluid when .running in theopposite-direction.

Describing a cycle of operation ofthe engine'and staiflng withthe partsin their relative positions as herein illustratcd,; the motiveuidpassesiroln' the supply conduitsuch as' the live handle (not shown)through the bossato the longitudinal passager/z2 from whence it isdistributed through `the always` open ports b, b2 and b" to theannulargrooves, e2 and c the engine is respectively. Inithis particularadjustment of the valve the motive uid supplied to the two upperanvnular` grooves @and e" is admitted at the proper time, to thedifferent cylinders by 'means yof the series 0fchannels E and E but,asis evident,l the motive fluid 105 other positionsto which itis,adjustable'flprovide l which enters the lower annular groove e isynot ad- 'mitted anywhere in this adjustment of the valve inasmuch as itsadmission channels E are at this time inactive. The admission of themotive fluid to the 5 cylinders in succession causes a rotation of thecrank shaft which is common to all of the pistons of these cylinders andthe rotation of such crank shaft is communicated through the pinion lcto the gear l whereby the tool shaft or spi-ndle is rotated. Therotation of the toolrshaft causes a rotation of the valve E through thegear L5 secured tothe 4tool spindle and the pinion E5 formed at thelowerend ofthe valve, `which pinion is always in engagement with itsgear' L5 to'whatever position the valye may be adjusted, the pinionbeing '15 elongated for this purpose. In this manner the valve Eisrotated so'as to alternately present its active inlet channels andactive exhaust portsalternately to the passages leading to the pluralityof cylinders.

When the'valve is in the position shown in Fig. 2

the motive fluid 'passes to the cylinder A from the groove 3 and throughone of the channels E", and

thence through the passage IB to said cylinder A.

The valveA 'E moving in a clockwise direction (Fig. 2)

the motive fluid is vsupplied' to the cylin'derA'2 by ar furtherrotation of the valve'through another one of the inlet channels Elf, itbeing understood that one 'of the exhaust ports F3 has just been rotatedout ofA reg'ister with the passage B2, wit'hwhich one of the inlet'channels E" is now brought into register. At or about this g.

timethe admission of motive fluidthfough the passage Wis cutoff and oneof the exhaust ports F3 is brought into register with said passage B andlthe cylinder A thereby exhausted, such operations following `each othersuccessively in the rotations of the engine. In

likevmanner the ymotive fluid is supplied to the cylinders Aa and .Alfrom' the annulai groove e'l byl means of the inlet channelsiE'fand thelpassages Blf landy B4, ythe relative arrangement of theinlet channelsand exhaust ports of the lower set of cylinders bengstaggered 40 oroutofalinement with the correspondingly active channels E3 and-exhaustports F3 with the result that 'the motive lfluid is admitted through thepassages Bf and 11'4 at or about the same time .and exhaustedthrough-the other two passagesB2 and B3, and vice versa, alternately inthe rotitions of the valve.

According to the particular construction illustrated in the drawings,`wherein each set of inlet and exhaust passages comprises three passagesspaced .around the circumference of tho valve, (for instance the set ofin let passages Ei" illustratedy in Fig. 6 are three in nu m.

ber` and ,the sameis truevof the set of exhaust ports F equidistantlyspaced on the circumference of the valve) itis evident that each pistonlmakesthree complete strokes or cydles and consequently the Acrank shaltmakes three complete rotations for every rotation ofthe valve. v Theproper movement or timing'of the valve is obtained bythe proper relativesizes of the I gearing which drives such valves, it being understoodthatthe valve is driven or rotated through. thc medium of thepinion Esecured to or formed at its -lower-end and the gear L" which meshestherewith yand whichis mounted or securedl upon theto'ol spindle L; -Asherev inbefore stated, the toolspindlo is itself-driven or rotatedthrough the medium ol' itsgear li and the pinion the engine. The propergoverning of the different cylinders by means of-the valve is thusobtained without any excessive speed of rotation of the valve which hasa speed of only 1 to 3 as compared with the speed of rotation of thecrank shaft of the machine. ,i

When it is desired'to reverse the direction of rotation, the valve yismoved or adjusted upwardly longitudinally by an upward pull of the valverod or stem F, at which time the spring pressed pin will engage thelower recess f3 and thereby hold the valve in such ad- 75 `justedposition. This adjustment of the valvebrings the inlet channels andexhaust ports, heretofore inactive, to an active position and at thesame time renders active such heretofore inactive channels and exhaustports. 1n other words the inlet channels E and 80 the exhaust ports' F*are brought into position so as to cooperate with the passages B/ and BZof the upper set of cylinders and to control the motive fluid theretoand therefrom, and in like manner the inlet `channels E and the exhaustports -F/ are brought into cowerag5 tive relationship with the passagesBu and Bl of the lower set of cylinders and the same are thereby enabled'to control the motive "fluid to and from such cylinders.V

In this position of the valve the live motive fluid whichy enters theannular groove e2 is admitted to the upper 90 set of cylinders throughthe paages B andz'thou'gh the-channels E4 and-,exhausted therefrom bythe fexhaust ports F4, while the motive fluid to the lowe'r set ofcylinders isadmitted'iimr'the annular groove'e and manuels E to' thepassags and B* and ,exhausted 95 therefrom through the exhaust ports^F/.` It is understood that owing to thel staggered Yrelationship o theinletl channels to the exhaust ports in thetwo .upper series and thecorresponding staggeredrelationship of -the channels and exhaust portsin the lower series, the 10() ldescribed adjustment of the valve-causesa reversal f the successive admission and exhaust of motive Huid to andfrom the cylinders so that the direction of rotation of the crankshaftis reversed, j

From the foregoing description it will be observed that my fluidpressure operated engine or "drill is sirnple in construction andoperation and is most compact; considering the power or energydeveloped. Moreover the motive fluid to and from the plurality ofcylinders is entirely under the control of a single valve which, by asimple adjustment in position thereof, is enabled to cause a reversal ofthe direction of rotation o the engine or drill. The single valve istherefore both. `a 4controlling valveand a reversing valve. j ,Thehandle M hereinbefore referredto issimplyall' .l grasping handle anddoes not cooperate with or actuate the force leed mechanism other thanto simply screw A upon the feed screw N, whereby the grasping handle` isconveniently held, in a removable manner, to they'l engine or drill..When the engine or drill is employed with a force feeddevice, the handleM is removed and the fced'screw N is provided with a'cylindrical feedscrew sleeve or nut O which isintemally screw thread .ed so as to engage'the external screw threads of the feed screw. Thisnnt is provided 'withthe usual centering point O at its upper end and also with the handwheel' orvpilot Of which is common in force 'feed dcvices of thisgeneral character. This construction Mid arrangement is illustrated byFig. 8 which shows the parts on a somewhat reduced scale as'coniparedwith drilling operation.I

.A 1`. In ah'ilv'uldpressure operated drill, thc combination of 1gplnralitylof cylinders arranged in two sets lying in parallel -planes cach set comprising two cylindersv withaxes cpmmocrhnklshafnand a singlerotatable valvel com. trolling theadmisslon and exhaust of the motivefluid to and from all oi.' the cylinders, said valve having two sets orseries'of ports and passages tor such admission and exhans t,one setbeingedective when the valve is in one posinon to cause rotation of thedrin vin one daemon and the other set. being atsuch time ineitective butarrahged to adillitwland` e'xhdlt'l'liotive iiuld to and from thecylinder 20ml rotation ot thedrill ln the reverse direction.

when the valve ls adjusted to lanother 'position'to cause 2. 1n a iiuidpressureoperated drill, the combination ot a plurality oi' cylindersarranged in two Asets lying ln parl. allel `planes-,each set 'comprisingtwo cylinders' with axs at right angles; pistons in the cylindersconnected with a common 'cranlrmshafty a single rotatable valve forlcontrollhlvngx.the"admission` and exhaust of motive fluid to and Vindusall the cylinders, find means for shifting-'the valve longltudinallyforreversing the drill and holding the same in adjusted positionwith ayielding pressure.

3. In a tlirldpressure operated drill, the combination of a plurality ofcylinders' arranged in two setslying in parallel planes, each setcomprising two cylinders with axes I 'a plurality of cylinders arrangedin two sets lying in parat right ang1es.'pi St0ns in the cylindersconnected with a common crank shaft, a. single. rotatable valve forcontrolling the. admission and exhaust oil-motive fluid to and tromallthe cylinders, a rod or4 stem connected with the 'valve' whereby vthelatter may be shifted longitudinally for reversing the drill, and meansfor holding said rod or stem in one position or the other wltliayielding pressure.

, 4. In a fluid pressure operated drill,4 the combination of allelplanes, eachset comprising two cylinders with axes at right angles;pistons in the cylinders connected with a common crank shaft, Saslnglerotatabl valve for controlling the admission and exhaust of motive duidto and from all the cylinders, a rod or stemv'con'nccted with the 'valvewhereby the latter may bc shifted longitudinally for reversing thedrill,' and means for-holding said rod or stem in one position or theother with a yielding pressure, comprising u spring pressed pin engagingsaid valve stem. 4

. 5. In a fluid pressure operated drill, the, comblnationof a pluralityof cylinders arranged in two sets lying in parallel planes, .eachseteomprising twmcylinders with axes at right angles, pistons in-thecylinders connectedy with a common -crank shaft, a single 'rotatable'valve 01* con trolling the admission and exhaust of motive duid to andfrom all the` cylipdersf'a rod or; stem having a ball and .socketconnection' with the valve whereby the latter may 'beshifted forreversing the drill, and means for maintaining the valve stem and valvein one position 'or the other according. to the .esiredldirectlouI ofrotation oi! the drill. 6. Ina iiuid pressureoperated drill, the'combination with a plurality .of cylinders having motive iiuid passagescomnuinicating therewith, pistons `in said cylinders, a fdi-'ivenelement to which said pistons are operatively .cons nested, avalvecaslng with which said passages communicate, a single valve withinsaid casing having one series of ports for controlling the supply'and.exhaust of motive fluid to and from a plurality of thecylinders torotate the driven element in on direction, and a second series of portsfor controlling the supply vand exhaustvof motive duid to and'from saidplurality of cylinders to rotate the driven element in a reversedirection, means for actuatingsaid valve to control-the supply; andexhaust `oi? motive duid, and means for adjusting the position of theports thereof with respect to 'said passages to determine the di- Notionof rotation of said element.

scossa 7. In a'tluid pressure operated drill, the combination with-aplurality of cylinders havlngmotive iluld passages communicatingtherewith, pistons in said cylinders, a

driven element to which said pistons are operatively consaid valvev toycontrol the supply and exhaust of motive fluid, and means for adjustingthe valve axially to bring` either series of portathereiniinto alinementwith said passages.' -8. In a lluid pressure operated drill, thecombination with a pair of cylinders having motive fluidA passagescommunlcat-lng 'therewith; of pistonsA in said cylinders, a

`driven element to which said pistons are operatively connected, a valve'casing'with which said passages communicate, a'single vulve'wlthin saidcasing having one seriesA of ports forcontrolling -the supply andexhaust oi'motive.

duid to and from' the pair 'of cylinders to rotate the r driven elementin one Vdirection and a second series of ports for controlling thcsupplyand exhaust of' motive fluid to and from said pair of cylinders to`rotate the driven element ln a reverse direction,v means for adjust`lng the posit-ion of the valve to bring either series ot cylinder, adriven element to which said pistons are operatively connected, alvalvecasing with `which said passages communicatel a single valve locatedwithin saidcasing and having `one series of ports for controllingthe ysupply and exhaust of motive iiuid to and from 'one pair of cylindersandl a secondserles'- of ports for controlling the'supply and exhaust ofmotivefluid to the other pair of cylinders to rotate the driven elementin one direction,

' 'a third series of por-ts for-controlling the supply and e x' haust ofmotive iluld to the iirst pair of cylinders to ro-l tute 4the drivenelement in a reverse direction, and a fourth series of ports to controlthe supply and exhaust ot motive fluid to the second pair of cylindersto rotatel the, driven elementA in said reverse. direction,- means foractuating said valve to controlthe supply and exhaust of motive duid,and means for adjusting the position of the valvel'to bring either said'first and second series o! ports or said third and fourth series ofports into alinei ment with said passages according to the direction inwhich the element is to be rotated.

10.' In a iiuid pressure operated drill, the combinat lon with a pairot'cylinders having motive iuld passages communicating therewith,l ofpistons in said cylinders; ,a driven element to whichfsaid pistons areoperatively connected, a,va1ve casing with which said passagesVcommunicate, a cylindrical valve located within said casing having11..In a iluid pressure operated drill, the combination with a pair ofIcylinders having motive fluid 'passages communicating therewith,l otpistonsin said cylinders, s. driven element to which said pistons areoperatively connected, a valve casing with which said passagescommunicate, "a cylindrical valve vlocated within said casing havlng acentral exhaust passa/ge and two parallel series oi' radial exhaustports leading ytherelnto, said valve having inlet channels intermediateof the `exhaust ports in each tos series, means for rotating said valveto control the'sup.

ply and exhaust ot motive iluld4 toand trom-said passages, 4

a rod connected to one end of same axially, and means engaging said rodto lock the same in position to locate either of said series of portsand channels in alinement with said passages.

12. In a tluid pressure operated drill, the combination with a painofcylinders having mo'tive tiuid passages pistons in said cylinders,

f a driven elementto which said pistons are operatively channelsin,aline'ment with said operatively connected, Ya valveterior of thehollow valve which said passages com grooves llrits surface and two saidgrooves each series ,comprising surface channels leading frein' theadjacent grooves andexhaust ports comx'unicatin-g with the hollowcenter/of the valve intel-lneL diat'e-:o'f the supply ports, tiefsupplyIand exhaust ports in -.the two series being staggered, Aineans foraxially adjusting said valve to bring eithei-i'series of ports andactuating saidyaivev to control ofmotive fluid.v i .Y l f 'v 13. In auid pressure operatedA drill,`the` combination with two pairs of..cylinders having'l motive' duid supply and exhaust passagesleadingthesseto,` of .pistons inxysaid cylinder`s,` a driven elerneniuyto u, hvifh said pistons `are ingi..wit`ii which said leading from theadjacent communicating with the inand intermediate to'` the sup plychannels, the supply channels and exhaust `ports in adjacent seriesbeing staggered, nieans for axially ad grooves and exhaust ports saidvalve for movlngthe y passages. and means for the supply and exhaust'oiE'a plurality of i l common to-*said pistons, 'a valve forcontrollingr the nd- `mission and exhaust of .the motive iiuid to andfrom the casses at diiferent positions along its length, and a springpressed pin arranged to engage one or the other of said recesses to holdthe valve in one or the other oi its adjus-ted positions.

.' 15. In aiiuid pressure operated drill, the combination cylinders,pistons therein, a crank shaft the crank shaft,

holding the valvesin its adjusted position comprising a rod or stemhaving'a hall and socket connection with they valve and provided alongits length wila two recesses nt diiferent positions. and a springpressed pin arranged to engage one or rthe'other of said recesses tohold the valve in one or the other of its adjusted positions.

WILLIAM O. DUN'lLEY. Witnesses GERTRUDE C. Anils'rnoxo, S. E. Humax.

of the series ofl

